English Title: Investigation of the extended galactic region in the longitude range between 37 deg and 43 deg for diffuse emission and pointsources in the energy range above 1 TeV with the HEGRA-Tscherenkov-Telescope-System

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Translation of abstract (English)

A survey of the galactic region between $l=[37^circ,43^circ]$ and $b=[-11^circ,6^circ]$ with an energy threshold of 1 TeV has been carried out in summer 1999 with the stereoscopic HEGRA Cherenkov telscope system located at La Palma, Canary Islands. The aim of the survey was to search for diffuse emission of $gamma$-radiation from the Galactic plane and to search for emission from point sources. A description of the measurement campaign, the analysis methods and detailed Monte Carlo simulations for the acceptance of electromagnetic showers over the field of view are presented. No emission is detected from the Galactic plane and no point source is discovered in the observed region. The derived upper limits for any point source are of the order of 1/10 of the flux of the Crab nebula. The 99 confidence level upper limit derived for the diffuse emission from the Galactic plane is $Phi(E>1$ TeV$) < 3.8cdot10^{-9}$ ph cm$^{-2}$ s$^{-1}$ sr$^{-1}$.